Write the subsequent lisp functions add2 add5 and double if

Question

Question: Write the subsequent LISP functions, add2, add5 and double, if they executed will produce the following results:

1- (add2 5)

                7

2- (add5 5)

                10

3- (double 7)

                14

Be sure to include comments. Comments should be included in the program you need to prepare this program in LISP language.